The servers with DAS are using a PERC 5/i integrated SAS 3.0 Gb/s RAID controller. They are running ESX 3.5 with a couple SQL servers, an Exchange server and 10 other Windows servers and both are performing well. I would like to add a SAN and I'm trying to figure out what I need performance wise. I know the vendors will help with sizing but I wanted to hear opinions and real world experiences.

Will the SAN with (14) 10k SAS perform as well as the 15k DAS or should I consider a SAN with 15K SAS?
What impact will the two servers have on the shared SAN vs. each having their own DAS?
What if I wanted to add a 3rd or even a 4th ESX host to to the same SAN without adding bandwidth, should I be concerned?

We're also considering a Dell EqualLogic PS5000E with (16) 250GB SATA at our DR site. Do you think the SATA SAN will perform well enough to restore critical services with lower performance or should I stick with SAS?

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